We separate tiny portions of our code into a function so we can call this function multiple times, move it to a separate file, and much more.
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In any moderately complex JavaScript program, everything happens inside functions.
Functions are a core, essential part of JavaScript.
What is a function? A function is a block of code, self contained, and we can tell our program to run that code when we need it.
Here’s a function declaration:
function test() {
// do something
}The // do something comment is a placeholder for a set of instructions that can be long as much as you want.
When you want to run this function, you “call it” or “invoke it”, like this:
test()Lessons in this unit:
| 0: | ▶︎ Introduction |
| 1: | Function parameters |
| 2: | Returning values from a function |
| 3: | Arrow functions |
| 4: | Nesting functions |
| 5: | Immediately-invoked functions |
| 6: | Recursive functions |